Oops, it doesn't look like 'harbor any day' is a national day..

Other days

stress awareness

Stress Awareness Day
unicorn

Unicorn Day
boyfriend

Boyfriend Day
boba

Boba Day
aloxolt

Aloxolt Day
ponytail

Ponytail Day
ruby

Ruby Day
tulip

Tulip Day
hiv awareness

Hiv Awareness Day
blanket fort

Blanket Fort Day